Answer
h=8
Work Step by Step
$Area=120=1/2 \times bh$
$b=3h+6$
$120=1/2 \times (3h+6)(h)$
$240=3h^2+6h$
$3h^2+6h-240=0$
$h^2+2h-80=0$
$(h+10)(h-8)=0$
$h=-10,8$
$h=8$, because height cannot be negative
Algebra 1
by Hall, Prentice
Published by
Prentice Hall
ISBN 10:
0133500403
ISBN 13:
978-0-13350-040-0
Chapter 10 - Radical Expressions and Equations - Get Ready - Page 597: 11
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